摘要： 题目描述： Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To ma 阅读全文

摘要： Description: 魔兽世界的西面是红魔军的司令部，东面是蓝魔军的司令部。两个司令部之间是依次排列的若干城市，城市从西向东依次编号为1,2,3 .... N ( N <= 20 )。红魔军的司令部算作编号为0的城市，蓝魔军的司令部算作编号为N+1的城市。司令部有生命元，用于制造武士。 两军的司 阅读全文

摘要： 题目描述： Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contain 阅读全文

摘要： 题目描述： Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example: Given "25525511135", ret 阅读全文

摘要： 题目描述： Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given n = 3, there are a total of 5 uniq 阅读全文

摘要： 题目描述： Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n = 3, your program 阅读全文

摘要： 题目描述： Given an absolute path for a file (Unix-style), simplify it. For example, path = "/home/", => "/home" path = "/a/./b/../../c/", => "/c" Corner C 阅读全文

摘要： 题目描述： Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two ele 阅读全文

摘要： 题目描述： Given an unsorted array of integers, find the length of longest increasing subsequence. For example, Given [10, 9, 2, 5, 3, 7, 101, 18], The lon 阅读全文

摘要： 题目描述： Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums e 阅读全文